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1. (1)2 700"等于多少分？等于多少度？ (2)把$78°54'$化成度的形式.
答案
(1)45' 0.75°
(2)78.9°
(2)78.9°
2. (1)把$21.3°$化成度、分、秒的形式.
(2)$23°42'36''$等于多少度?
(2)$23°42'36''$等于多少度?
答案
(1)21°18'
(2)23.71°
(2)23.71°
3. 计算:
(1) $70°31'44'' + 109°28'16''$;
(2) $25°34'48'' - 15°26'37''$;
(3) $32°45'48'' + 21°25'14''$;
(4) $92°10'20'' - 18°17'50''$;
(5) $105°18'48'' + 35.285°$;
(6) $90° - 15°41'29'' × 3$.
(1) $70°31'44'' + 109°28'16''$;
(2) $25°34'48'' - 15°26'37''$;
(3) $32°45'48'' + 21°25'14''$;
(4) $92°10'20'' - 18°17'50''$;
(5) $105°18'48'' + 35.285°$;
(6) $90° - 15°41'29'' × 3$.
答案
(1)180°
(2)10°8'11''
(3)54°11'2''
(4)73°52'30''
(5)140°35'54''
(6)42°55'33''
(2)10°8'11''
(3)54°11'2''
(4)73°52'30''
(5)140°35'54''
(6)42°55'33''
4. 已知$∠ A$与$∠ B$互余，若$∠ A=20°15'$，求$∠ B$的度数.(结果化成度)
答案
∠B=69.75°
5. 若$∠ α = 23° 36'$,求$∠ α$的补角.(结果化成度)
答案
∠α的补角=156.4°
